ATA6617 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
ATA6617
Atmel Corporation
'ATA6617' PDF : 308 Pages View PDF
Atmel ATA6616/ATA6617
Table 4-7. Internal Calibrated RC Oscillator Operating Modes(1)
Frequency Range(2) (MHz)
CKSEL3..0(3)(4)
CSEL3..0(5)
7.6 - 8.4
0010
Notes: 1. If 8MHz frequency exceeds the specification of the device (depends on Vcc), the CKDIV8
fuse can be programmed in order to divide the internal frequency by 8
2. The frequency ranges are guideline values
3. The device is shipped with this CKSEL = “0010”
4. Flash Fuse bits.
5. CLKSELR register bits
When this Oscillator is selected, start-up times are determined by the SUT Fuses or by CSUT
field as shown in Table 4-8.
4.5.2.3
Table 4-8. Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
SUT1..0(1)
CSUT1..0(2)
00(3)
Start-up Time from
Power-down/save
6 CK
Additional Delay from
Reset (Vcc = 5.0V)
14CK
Recommended Usage
BOD enabled
01
10(4)
6 CK
6 CK
14CK + 4.1ms
14CK + 65ms
Fast rising power
Slowly rising power
11
Reserved
Notes: 1. Flash Fuse bits
2. CLKSELR register bits
3. This setting is only available if RSTDISBL fuse is not set
4. The device is shipped with this option selected
128 KHz Internal Oscillator
The 128KHz internal Oscillator is a low power Oscillator providing a clock of 128KHz. The fre-
quency is nominal at 5V and 25°C. This clock may be selected as the system clock by
programming CKSEL Fuses or CSEL field as shown in Table 4-5 on page 49.
When this clock source is selected, start-up times are determined by the SUT Fuses or by
CSUT field as shown in Table 4-9.
Table 4-9. Start-up Times for the 128kHz Internal Oscillator
SUT1..0(1)
CSUT1..0(2)
00(3)
Start-up Time from
Power-down/save
6 CK
Additional Delay
from Reset (Vcc = 5.0V)
14CK
01
6 CK
14CK + 4.1ms
10
6 CK
14CK + 65ms
11
Reserved
Notes: 1. Flash Fuse bits
2. CLKSELR register bits
3. This setting is only available if RSTDISBL fuse is not set
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
51
9132D–AUTO–12/10
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